2-5/8" O.D. Socket is Used to Remove and Install the Hub Nut on 2021 and Newer Chevrolet Silverado and GMC Sierra With 11-1/2" or 12" Single Rear Wheel Axle Hubs. May work on other vehicles with 2-1/8" I.D. axle nut/O.D. spindle. Full-floating hubs are held on with a circular nut that is engaged by the 4 pin socket for removal and installation. The 1/2" drive socket is hardened for durability with a black oxide finish. Not for impact use.